Formatting numbers using DecimalFormat

java decimalformat
Jon picture Jon · May 16, 2013 · Viewed 80.8k times · Source

I am trying to format prices using DecimalFormat, but this isn't working for all variations.

DecimalFormat df = new DecimalFormat("0.##")
df.format(7.8)
df.format(85.0)

prints

7.80

and

85

but "7.79999" gets formatted as "7.8", not "7.80". I have tried doing things this way

DecimalFormat df = new DecimalFormat("0.00")

to force two dp, but then "85.0" gets formatted as "85.00" not "85"!

Is there a way of capturing all variations, so that prices are printed either as #, ##, or #.##? For example:

5, 55, 5.55, 5.50, 500, 500.40

Answer

Raza picture Raza · May 16, 2013

There is a slight difference between these two formats. The "#.##" means it will print the number with maximum two decimal places whereas "#.00" means it will always display two decimal places and if the decimal places are less than two, it will replace them with zeros. see the example below with output. 

public static final DecimalFormat df1 = new DecimalFormat( "#.##" );
public static final DecimalFormat df2 = new DecimalFormat( "#.00" );

System.out.println(df1.format(7.80));
System.out.println(df1.format(85));
System.out.println(df1.format(85.786));

System.out.println(df2.format(7.80));
System.out.println(df2.format(85));
System.out.println(df2.format(85.786));

And the output will be 

7.8
85
85.79

7.80
85.00
85.79

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